Analysis of main chain torsion angles in proteins: prediction of NMR coupling constants for native and random coil conformations.
Using a data base of 85 high resolution protein crystal structures the distributions of main chain torsion angles, both in secondary structure and in coil regions where no secondary structure is present, have been analysed. These torsion angle distributions have been used to predict NMR homonuclear and heteronuclear coupling constants for residues in secondary structure using known Karplus relationships. For alpha helices, 3(10) helices and beta strands mean predicted 3JHN alpha coupling cons...Expand abstract
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